error[E0259]: the name `core` is defined multiple times --> $DIR/no-std-inject.rs:14:1 | LL | extern crate core; //~ ERROR: the name `core` is defined multiple times | ^^^^^^^^^^^^^^^^^^ `core` reimported here | = note: `core` must be defined only once in the type namespace of this module help: You can use `as` to change the binding name of the import | LL | extern crate core as other_core; //~ ERROR: the name `core` is defined multiple times | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: aborting due to previous error For more information about this error, try `rustc --explain E0259`.